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參數(shù)資料
| 型號： | TPS65552ARGTT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 3 A BATTERY CHARGE CONTROLLER, PQCC16 |
| 封裝： | PLASTIC, QFN-16 |
| 文件頁數(shù)： | 19/21頁 |
| 文件大?。?/td> | 982K |
| 代理商： | TPS65552ARGTT |
www.ti.com
PRODUCT
PREVIEW
OFF
ON
OFF
SW
T
LOGIC
V
I
VZERO
VSW
VBAT
VA
VOUT
0 V
ISW
IPEAK
0 A
IOUT
IPEAK/NTURN
0 A
Time 1
Time 2
Time 3
Time 4
Time 5
SW
T
VFULL
CHG
XFULL
OFF
ON
OF
F
OFF ON
OFF
VBAT
VSW
0 V
VBAT
VOUT
VA
0 V
VOUT
VA
IPEAK
IPEAK/NTURN
IOUT
ISW
IOUT
0 A
V
I
Control Charging
t
= L
ON
I
PEAK
V
BAT
÷
è
(1)
TPS65552A
SLVS567 – JULY 2005
Figure 5. Timing Diagram at One Switching Cycle
Figure 6. Timing Diagram at Beginning/Ending
The TPS65552A provides three comparators to control charging. Figure 2 shows the block diagram of
TPS65552A and Figure 5 shows one timing diagram switching cycle. Note that emphasis is placed on Time1 and
Time3 of the waveform in Figure 5.
While SW is ON (Time1 to Time2 in Figure 5), U3 monitors current flow through integrated power-MOSFET from
When SW turns OFF (Time2 in Figure 5), the magnetic energy in the transformer starts discharging. Meanwhile,
U2 monitors the kickback voltage at the SW terminal. As the energy is discharging, the kickback voltage is
increasing according to the increase of VOUT (Time2 to Time3 in Figure 5). When almost all energy is discharged,
the system cannot continue rectification via the diode, and the charging current of IOUT goes to zero (Times3 in
Figure 5). After rectification stops, the small amount of energy left in the transformer is released via the parasitic
path, and the kickback voltage reaches zero (Time3 to Time4 in Figure 5). During this period, U2 makes SW turn
ON when (V(SW) - VBAT) dips from V(ZERO) (Time5 in Figure 5). In the actual circuit, the period between Time4
and Time5 in Figure 5 is small or does not appear dependent on the delay time of the U2 detection to SW ON.
U1 also monitors the kickback voltage. When (V(SW) - VBAT) exceeds V(FULL), TPS65552A stops charging (see
Figure 6).
In Figure 5 and Figure 6, ON time is always the same period in every switching. The ON time is calculated by
Equation 1. This equation is not dependent on output voltage.
However, OFF time is dependant on output voltage. As the output voltage gets higher, the OFF time gets shorter
(see Equation 2).
7
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